Lock-bar pipe.



Nd: 822,004. FATENTED MAY 29, 1906.

M. KRONAUER.

LOOK BAH PIPE.

' APPLICATION FILED JUNE 17, 1905.

WITNESSES: INVENTOR,

Z "M MQWI QUE/79M 072m ATTORNEYS.

NITED STATES PATENT OFFICE.

Specification of Letters Patent. Application filed June 11, 1905. Serial No. 265,653.

Patented ma ae, 1906.

To all-whom, it may concern.- Be it known that 1, MAX KRONAUER, a citizen of the Republic of'Switzerland, residing in Paterson, county of Passaic, and State 0 I New Jersey, haveinvented certain new and useful Improvements in Lock-Bar Pipes; and

I-do hereby declare the followin to be a full,

-tiloill- I 1 I This invention relates to that tips" of'what' are known as "lock-barflpipes w trated in my United States Letters Patent No. 773,945. a The present invention has for its object to perfect as far as possible that form of pipe in respect mainly to its ability to resist the tend-.

ency of internal pressure to disestablishior disrupt the joint'produced. This-is acco'm plished by maki the extreme edge portion of the part 0 each plate which is embedded in the lock-barjstand bent ofi' relatively to the remainder of the said embedded portion,-so ,that the cross-section reveals an angle or bend in the said embedded portion; Preferably,and as herein shown, such band is an outward one, so that the result is that with regard to the embedded portions of the two plates they stand farther apart at theirextremities than where they enter'the-bar.

The stability and strength of this construction, especially in the preferred form, where in the tendency on thepart of very high internal pressure to open the bar and cause the plate edges to slip out is at once resisted by the, as it were, hook-shaped 'form of the plates, will be at once ap arent. T

My improvement companying drawings .in three figures.

Figure 1 is a (perspective view of a length ofthe. improve pipe; Fig. 2, anenlar ed cross-sectional viewof the .parts assemb ed before closing, and Fig. 3 a similar. view of the parts after closing. In said drawings, 'a the same havin designates the plates,

plane 0 the contiguous portions 1) .of the plates, so as to form longitudinal flanges c which after the plates have been assembled ch is illusis il ustrated in the ac their. longitudinal ed es, bent 'ofi prefera ly at right angles to t e together out of said planeto form flanges/an in tubular disposition stand arallel or substantiall parallel to each ot er, projecting, preferab y, outwardly. j d is the lock-bar. This is formed withlongitudinal grooves 0 arranged in the side thereof'which stands plates in the final assemblage. of the rts, and thus producing three longitudinal files or jaws f ,9 h." When the bar issues from its forming process, thebase of the 11 or jaw g is wider, as at i, than its extremit The plates being formed witht e flanges c, as abovedescribed, and then, assembled in the form of a tubular body, the bars are a plied, the flanges c bein inserted into t e grooves e as far as the epths of the latter The bar is now compressed or I will permit. squeezed, which action, on account of. the form of the fin or jaw g, makes the parts have ultimately the form shown in Fig. 3, where each flange e has a kink orbendry'", and the metal of the bar on both sides of such flange follows in ferm substantially the form of said flange. 1

next adj agent to, the

. It will be aimed that I do not w th to be limited either to the specific form of the invention herein describedand shown by way of'expxllanation, nor to the manner in which the a1 result is attained;

. What I claim is- 1. The combination of two sheet-metal bodies having their edge portions lying in substantially the same plane and projecting toward each other and a lock-bar joining an securing to ether said edge portions, the extremities 0 said edge portions being bent up out of said plane to form flanges and said lock-bar having lon itudinal parallel grooves formed inthe side t ereof next adjacent said edge portions and receiving said flanges, each ed e portion or flange having, within the loc -b'ar,- a longitudinal bend or kink, and said lock-bar being interiorly shaped to substantially conform with said flanges, sub-- stantially as described. V

, 2. The combination of two, sheet-metal bodies having their edge portions lying in substantiallythe same plane and projecting toward each other and a lock-bar j oining, an

securing to ether said edge portions, the extremities 0 said edge portions being bent u said lock-bar having longitudinal parallel grooves'formedin the side thereof next said edge portions and receiving said flanges, the have-hereunto set-my hand this 13th day of fiortionshof sgid flgngesbwithin therlock-balll' June, 1905.

avingt eiree e ges ent awayv 0m eac other, and said lock-bar being interiorly MAX KRONAUER' 5 shaped to substantially conform with said Witnesses: flanges, substantially as described. JOHN W. STEWARD, In testimony that I claim the foregoing I I. D. STEWARD. 

